Prudhoe Bay 1949 BAR Photography WMS

Circumpolar Arctic Floristic Provinces Map

Data

Floristic sectors characterize the considerable east-west floristic variation within the subzones. The more northern Arctic bioclimate subzones have a relatively consistent core of Arctic plant species that occur around the circumpolar region. Further south, local east-west variation is related t...

Circumpolar Arctic Substrate pH

Data

Differences in substrate chemistry have important effects on dominant plant communities. Some of the most important effects are related to soil pH, which governs the availability of essential plant nutrients. Soils in the circumneutral range (pH 5.5-7.2) are generally mineral rich, whereas the fu...

Arctic Alaska Floristic Provinces Map

Data

The Arctic has a relatively consistent core ofplant species that occur throughout the circumpolar region, but there is also considerable east to west variation in regional floras, particularly in the southern bioclimate subzones. These differences are due to factors such as different histories r...

Arctic Alaska Bioclimate Subzone Map

Data

Various authors, working with different geobotanical traditions, have divided the Arctic into bioclimatic regions using a variety of terminologies. The origins of these different terms and approaches have been reviewed by the Panarctic Flora (PAF) initiative (Elvebakk 1999). The PAF and CAVM acce...

Arctic Alaska False Color-Infrared (CIR) Map

Data

Advanced Very High Resolution Radiometer (AVHRR) data were obtained from the USGS Global AVHRR 10-day composite data. (http://edcdaac.usgs.gov/1KM/1kmhomepage.asp) (Markon et al 1995). Glaciers and oceans were masked out using information from the Digital Chart of the World (ESRI 1993). The image...

Arctic Alaska Substrate Chemistry Map

Data

Differences in substrate chemistry, including pH, govern the availability of essential plant nutrients. Soils in the circumneutral range (pH 5.5-7.2) are generally mineral rich, whereas the full suite of essential nutrients is often unavailable in acidic soils (pH < 5.5) or in soils associated wi...

Land cover map of the Arctic National Wildlife Refuge (Walker et al. 1982)

Data

The Landsat-assisted environmental mapping of the northern coastal plain of the Arctic National Wildlife Refuge, Alaska was funded by the US Fish and Wildlife Service and the US Geological Survey and published by the Cold Regions Research and Experimental Laboratory (CRREL) as input to the Enviro...

Arctic Alaska Vegetation Map

Data

Mapped polygons at 1:7.5 million scale contain many vegetation types. The map portrays the zonal vegetation within each mapped polygon. Zonal sites are areas where the vegetation develops under the prevailing climate, uninfluenced by extremes of soil moisture, snow, soil chemistry, or disturbance...

Circumpolar Arctic Bioclimate Subzones

Data

A fundamental problem for the CAVM is how to characterize the transitions in vegetation that occur across the roughly 10 °C mean July temperature gradient from the tree line to the coldest parts of the Arctic. Various authors, working with different geobotanical traditions, have divided the Arcti...

Circumpolar Arctic Elevation Map

Data

Elevation strongly influences soil moisture and patterns of tundra plant communities. Areas less than 100 m above sea level were separated to show low-elevation plains. Areas above 100 m elevation were divided into 333-m intervals to show decreases of about 2 °C, as predicted by the adiabatic lap...

Circumpolar Landscape Age Map

Data

The landscape age map shows the length of time (in thousands of years) that Arctic landscapes have been available for plant colonization and the development of plant communities (Raynolds et al 2008). For most areas, this would be the time since the most recent deglaciation. Other areas first bec...

Circumpolar Arctic AVHRR False Color-Infrared (CIR) Map

Data

Advanced Very High Resolution Radiometer (AVHRR) data were obtained from the USGS Global AVHRR 10-day composite data. (http://edcdaac.usgs.gov/1KM/1kmhomepage.asp)(Markon et al. 1995). Glaciers and oceans were masked out using information from the Digital Chart of the World (ESRI 1993). The image...

Arctic Alaska Elevation Map

Data

Elevation strongly influences soil moisture and patterns of tundra plant communities. Areas less than 100 m above sea level were separated to show low-elevation plains. Areas above 100 m elevation were divided into 333-m intervals to show decreases of about 2 °C, as predicted by the adiabatic lap...

Landsat MSS Land Cover Map of Northern Alaska (Muller et al. 1999)

Data

National Science Foundation (NSF)

This map was created for the US National Science Foundation Land-Atmosphere-Ice Interactions (LAII) Flux Study and the Arctic Transitions in the Land-Atmosphere System (ATLAS) Study (OPP-9318530 and OPP-9415554).

The map covers all of northern Alaska, from the Brooks Range divide to the coast....

Ecosystems of Northern Alaska (Jorgenson & Heiner 2003)

Data

This map was funded by The Nature Conservancy to provide a seamless ecological context for analysis of the distribution of biodiversity in the Northern Alaska ecoregion. It covers all of Alaska north of the latitudinal treeline on the southern side of the Brooks Range. It is in raster tif format,...

Circumpolar Arctic Vegetation Map (Vegetation Layer Only)

Data

Mapped polygons at 1:7.5 million scale contain many vegetation types. The map portrays the zonal vegetation within each mapped polygon. Zonal sites are areas where the vegetation develops under the prevailing climate, uninfluenced by extremes of soil moisture, snow, soil chemistry, or disturbance...

Circumpolar Arctic Lake Cover Map

Data

Lake cover strongly affects the reflectance of the land surface over large areas of the Arctic, and was useful for identifying extensive wetlands. Lake cover was based on the number of AVHRR water pixels in each mapped polygon, divided by the number of pixels in the polygon. Since the imagery has...

Circumpolar Arctic Biomass Trend 1982-2010 (Epstein et al. 2012)

Data

Trend in Arctic biomass was calculated from a linear regression of biomass values for all years 1982-2010 (Epstein et al 2012). Pixels with significant trends (p < 0.05) were retained. Biomass was calculated from the relationship between AVHRR NDVI and ground sampling of biomass, as described bel...

2013 NSSI Landcover for North Slope of Alaska

Data

North Slope Science Initiative (NSSI)

This map is the outcome of a multi-year project to produce a moderate resolution landcover base map for the North Slope of Alaska to serve as a primary base layer for long-term science and planning activities on the North Slope. New Landsat Thematic Mapper (TM) 30 meter resolution landcover maps...